This may be a little premature, but the thought has occurred to me before. I think that Brian Scalabrine would make a really good coach some day. That said, I hope to see him back in Celtic green, but not until he is ready to contribute and do so from a good health standpoint. He needs to take his time and I am sure he has heard that before.
I have an acquaintance that has had multiple concussions from a long career in full contact karate. He always tried to be the tough guy and 'fight though' his injuries. He suffers now from erratic and severe headaches with nausea, mild seizures and sudden bouts of blurred/double vision.
All I can say is, that is not a way I would wish anyone to live.